noun. 
                    An abbreviation of millimeter.
                  
                
                  
                    
                    An abbreviation
                  
                
                  
                    
                    of the plural of Latin words commonly abbreviated masculine, as magistri;
                  
                
                  
                    
                    of the Latin matrimonium;
                  
                
                  
                    
                    of the Latin meritissimus.
                  
                
                  
                    noun. 
                    An abbreviation (in French) of Messieurs (gentlemen, sirs).
                  
                
                  
                    
                    An abbreviation
                  
                
                  
                    
                    of their Majesties;
                  
                
                  
                    
                    of Martyrs.
                  
                
                  
                    
                    An abbreviation of magnetomotive force.
                  
                
                  
                    
                    An abbreviation of square millimeter.
                  
                
                  
                    
                    An abbreviation of Master of Mechanical Engineering.
                  
                
                  
                    
                    An abbreviation of cubic millimeter. μμ. A symbol used to denote a thousandth of a micron or a millionth of a millimeter.